Question

我正在使用SQL Server 2012。

我有两个表，我正在尝试查看两个表包含多少行。他们没有可以加入的共同领域。以下是我目前的查询，显然不起作用。怎么会这样？

;with tblOne as
(
    select count(*) numRows from tblOne where DateEx = '2015-10-27'
),
tblTwo as
(
    select count(*) numRows from tblTwo where Status = 0
)
select tblOne.numRows + tblTwo.numRows

Answer 1

您不需要CTE;您可以将它们更改为子查询：

select 
    (select count(*) numRows from tblOne where DateEx = '2015-10-27') +   
    (select count(*) numRows from tblTwo where Status = 0)

如果您真的想要使用CTE，那么只需执行隐式CROSS JOIN：

with tblOne as
(
    select count(*) numRows from tblOne where DateEx = '2015-10-27'
),
tblTwo as
(
    select count(*) numRows from tblTwo where Status = 0
)
select tblOne.numRows + tblTwo.numRows
FROM tblOne, tblTwo

Answer 2

您可以使用cross join：

with tblOne as (
      select count(*) as numRows from tblOne where DateEx = '2015-10-27'
     ),
     tblTwo as (
      select count(*) as numRows from tblTwo where Status = 0
     )
select tblOne.numRows + tblTwo.numRows
from tblOne cross join tblTwo;

Answer 3

使用联合和查询

select sum(numRows) as numRows from (
    select count(*) numRows from tblOne where DateEx = '2015-10-27'
    union all
    select count(*) numRows from tblTwo where Status = 0
)

编辑：添加了union all，所以如果两个查询都有相同的行数，则会包含两个结果。

添加两个选择计数查询的总和

3 个答案: